sorting - Sort a Java collection object based on one field in it -

i have following collection:

collection<agentsummarydto> agentdtolist = new arraylist<agentsummarydto>(); 

where agentsummarydto looks this:

public class agentsummarydto implements serializable {     private long id;     private string agentname;     private string agentcode;     private string status;     private date createddate;     private integer customercount; } 

now have sort collection agentdtolist based on customercount field, how achieve this?

here "1liner":

collections.sort(agentdtolist, new comparator<agentsummarydto>(){    public int compare(agentsummarydto o1, agentsummarydto o2){       return o1.getcustomercount() - o2.getcustomercount();    } }); 

update java 8:

collections.sort(agentdtolist, (o1, o2) -> o1.getcustomercount() - o2.getcustomercount()); 

..it expects getter agentsummarydto.getcustomercount()